Results 271 to 280 of about 1,024,804 (310)

Actuators for Active Flow Control

Annual Review of Fluid Mechanics, 2011
Actuators are transducers that convert an electrical signal to a desired physical quantity. Active flow control actuators modify a flow by providing an electronically controllable disturbance. The field of active flow control has witnessed explosive growth in the variety of actuators, which is a testament to both the importance and challenges ...
Louis N. Cattafesta, Mark Sheplak
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Active Flow Control of Wing Separated Flow

Volume 1: Fora, Parts A, B, C, and D, 2003
Numerical investigations of active flow control, which can offer significant improvements to wind–turbine rotor and turbomachinery performance by suppressing detrimental effects of separated flow, are presented. Simulations of pulsating jet flow control applied on wings at low speed, high Reynolds number turbulent flow and fixed angles of incidence are
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Active Control of Unsteady Cavitating Flows in Turbomachinery

Volume 2A: Turbomachinery, 2019
Abstract A preliminary 2D numerical investigation of the active control of unsteady cavitation by means of one single synthetic jet actuator (SJA) is presented. The SJA has been applied to hinder the intrinsic instabilities of a cloud cavitating flow of water around a NACA 0015 hydrofoil with an angle of attack of 8° and ambient ...
de Giorgi M. G., Ficarella A., Fontanarosa D.   +2 more
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Development of Piezoelectric Actuators for Active Flow Control

AIAA Journal, 2001
The development of piezoelectric actuators for active e ow control is discussed. The type of actuators considered consists of a single sheet of piezoceramic material bonded to the underside of a shim: a “ unimorph” e ap design. Existing theoretical beam models are extended to incorporate a linear strain distribution in the composite unimorph beam ...
Louis N. Cattafesta III, Sanjay Garg, Deepak Shukla   +2 more
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Iterative design for active control of fluid flow

2001 European Control Conference (ECC), 2001
Iterative controller design for planar Poiseuille flow by model unfalsification and controller redesign is the topic of the paper. The main contribution is to show that model-unfalsification-based iterative design can be useful in flow control problems.
Veres, S.M., Baramov, L., Tutty, O.R., Rogers, E.   +3 more
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Simulation of Active Flow Control on a Stalled Airfoil

Flow, Turbulence and Combustion, 2003
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Spalart, Philippe, Hedges, Linda, Shur, Michael, Travin, Andrey   +3 more
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Active flow control applied to an airfoil

36th AIAA Aerospace Sciences Meeting and Exhibit, 1998
Results of numerical simulations of active flow control applied to an airfoil using the Reynoldsaveraged Navier-Stokes equations are presented. The simulations are first compared with the poststall separation control experiments of Seifert et al.1'12 on a NACA0015 at 1.2 x 106 chord Reynolds number.
John Donovan, Linda Kral, Andrew Cary
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Semantics of Control-Flow in UML 2.0 Activities

2004 IEEE Symposium on Visual Languages - Human Centric Computing, 2005
The recent major revision of the UML has introduced significant changes and additions. In particular, the metamodel portion underlying Activity Diagrams has been completely reengineered, with Activity being the central concept, the successor of ActivityGraph in UML 1.5.
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Multiscale Active Flow Control

2007
The physics of the multiscale patterns of flows is introduced in the first part: it is the foundation for analysis of the control of flow. Then a careful distinction is made between control as a passive mean for improving the properties of natural flows relevant to a given application, and control as a robust active tool to optimize a cost function ...
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Active Flow Control Strategies and Tools for Turbulent Flows

2019
In this chapter we present considerations on the impact of the turbulence characteristics of most flows of industrial interest on the flow control interpretations or strategies. In the second part we will give an overview of the CFD approaches, including actuator integration methods.
Jean-Paul Bonnet, Ning Qin
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